Magnetic heateb



C. S. CUSHMAN.

MAGNETIC HEATER.

APPLICATION FILED MAY 31, 1918.

1 307,773. Patented June 2;, 1918.

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ablfow ma d magnetic fluctuations of the core.

1 vention.

UNITED STATES PATENT OFFICE.

CHARLES S. CUSHMAN, OI BARBIE, VERMONT.

MAGNETIC HEATER.

Specification of Letters Patent.

Patented June 24, 1919.

Application filed m a1, 1918. Serial No. 237,560.

a full. clear. and exact description of the' invention. such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to new and useful improvements in electrical heating devices more particularly of that type utiliz Zing heat generated in the core of anelectromagnet through which an alternating current is passed.

It is in general the object or the present invention to improve the structure and in crease the heating efficiency of devices of this character, and it is more particularly the object to provide a most effective device for heating water. compressed air. or other confined fluid during its passage through a pipe line.

A further object resides in the provision of an arrangement wherein the number of heating units employed may be readily varied. to thus vary the amount of heat supplied.

A still further object resides in the provision of an arrangement embodying a heating magnet core wherein a secondary circuit is set up within the core to afford a heating thereotadditiomrl to the heat generated by lVith the above and other objects and advantages in view. the invention resides more particularly in the novel combination, formation and arrangement of parts hereinafte described and particularly pointed out in the appended claims.

In the drawings:

Figure 1 is a side elevational view of a magnetic heater embodying the present in- Fig. 2 is a sectional view tlierethrough showing one of the heating elements in plan.

Fig. 3 is a transverse sectional view through the device longitudinally of one of the heating elements, on the line -3-3 of Fig. 1.

Fi 4 is a transverse sectional view "5h one of the heating elements. he now more particularly to the lug drawings, the body frame 01' the device is formed of a section of pipe line, essentially of U-shape, and comprising the parallel side pipes 5 connected at adjacent ends by elbows 6 with a short pipe section 7 forming the bight of the U. The other end of one of the pipes 5 is provided with an attaching elbow S, and the corresponding end of the other pipe 5 is provided with a T-coupling 9 for connection with the main pipe line and with a suitable drain pipe 10. These last named ends of the pipes 5 are held against spreading by a suitable tie member 11.

. Any number of heating elements may be associated with the side pipes 5 to impart varying degrees of heat to fluid contained in the pipes, and in the present instance three heating units are employed. Each of these heating units comprises a magnetic core formed ota pair of sections 12 held in spaced position and insulated by transverse bars 13 disposed therebetween, and wound about each core is a magnetic coil 14. Each of the core sections is formed ofa series of plates, which are successively increased in length toward the outer Side of the section, the innermost plates being of a length substantially equal to the distance between the adjacent peripheral portions'of the pipes 5. When the cores are disposed between the pipes, the end portions of their laminations engage the peripheral surfaces of the pipes, the entire core thus presenting concave end faccsof substantially semi-circular curvature whereby the adjacent portions of the pipe form the outer extremities of the core. The laminations of the core sections are firmly clamped against the pipes by clamping bolts 15 passed transversely through the plates.

Thus upon passing alternating currentthrough the coils 1i. magnetic fluctuations will be set up within the cores, to heat said cores, the heating. action being strongest at the ends of the cores and thus imparting heat directly and in a most etlicient manner to the fluid contained within the pipes.

It will be noted that the complete heater is in effect a transformer of which the coils 14: constitute the primary element while the pipe constitutes the secondary element in addition to forming apart of the magnetic circuit. In use. the secondary element is allowed to run hot while the primary is r in at a sate temperature for the insulating ma terial. T hus, there is utilized in the heating of the fluid in the pipe, both the secondary current and the resultant of the rapid re- I versals of magnetic polarity, it being under- 1. A heater comprisinga U-shaped body frame formed of pipe sections, a plurality of cores extending transversely between and having their endsconnectedwith the sides of said frame and electric conducting coils I wound on said cores.

2. A heater comprising a pair of parallel pipe sections, a magnetcore formed of strips successively increased in length toward the outer sides of the core whereby to define concave end faces for the core body and engaging the peripheral surfaces of the each formed of a series of plates successivelyincreased in length toward the outer sides of the sections, clamping bolts passed through the plates of the sections for clamping the ends of said plates against the peripheral surfaces of the pipes and an electric conducting coil wound on said core.

In testimony whereof, I afiix my signature, in the presence of two witnesses. CHARLES S CUSHMAN. Witnesses:

JAMES MACKAY, HAzEL I. MACKAY. 

